HP 750c Service Manual - Page 147

9. TTOE The purpose of this test is to calibrate the Thermal TurnĆOn Energy for each cartridge. Perform the TTOE test as follows: 1 In the Service Tests submenu, scroll to 9 TTOE" and press Enter. SERVICE TESTS 9 TTOE 2 The Setting Voltages..." message is displayed on the frontĆpanel. 700 3 The plotter will automatically calibrate the black cartridge. 750C The Select a Position" message is displayed on the frontĆpanel. Use the Arrow buttons 750C Plus to select the cartridge that needs to be tested. 755 CM 4 Press the Enter button. 5 The Calibrating xxxx Pen" message is displayed on the frontĆpanel while the plotter calibrates the cartridge. xxxx represents the color of the cartridge that is being calibrated. 6 When the plotter has finished calibrating the cartridge, the TTOE Voltage #.## / Press Enter" message is displayed on the frontĆpanel. If the message TTOE fail" is displayed on the front-panel, then the cartridge has failed the test. To resolve the problem, try one of the following: 1 Clean the interconnect pad in the carriage or the cartridge that failed the test. 2 Replace the cartridge that failed the test. 3 Perform the pen continuity test ' page 8Ć30. 4 Replace the carriage ' page 6Ć34. 7 The Pen Voltage #.## / Press Enter" message is displayed on the frontĆpanel. The pen voltage value (#.##) is for reference purposes only. C4705-90000 Troubleshooting 8-29